#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <math.h>
#define N 30000
int main()
{
    float x, y;
    int c = 0, d = 0;
    random();
    while (c++ <= N)
    {
        x = random(101);

        y = random(101);
        if (x * x + y * y <= 10000)
            d++;
    }
    printf("pi=%f\n", 4. * d / N);

}